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Class D amplifier no low pass filter feedback with zero phase delay

  • US 5,949,282 A
  • Filed: 02/25/1998
  • Issued: 09/07/1999
  • Est. Priority Date: 02/25/1998
  • Status: Expired due to Term
First Claim
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1. A Class D amplifier, comprising:

  • a pulse-width modulator for converting an input audio signal into a digital waveform;

    an output stage for applying signal splitting and level shifting to said digital waveform to produce high and low digital driving signals; and

    an error amplifier circuit for comparing the output signal of said Class D amplifier to said input audio signal for error-correction purposes;

    a reference signal amplifier circuit directly coupled to said output stage for filtering noise from said high and low digital driving signals, and combining said high and low digital driving signals into a single analog reference signal, said reference signal amplifier circuit having a roll-off frequency greater than the frequencies of said high and low digital driving signals.

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